I already got five stars on Halls of Valhalla on expert guitar, and that's enough for me, the song is really cool, but unfortunately it's charted really weird with ho/po placements all over the place during the main riff, which makes it really awkward and frustrating to play.
No idea how hard the bass is, but I'll probably have more luck gold starring it there.
Halls of Valhalla isn't that hard on guitar if you just say 'fuck it' and strum everything. The hardest thing about the song are the first and third guitar solo. It's quite fun too once you get the hang of it.
isn't that what the instrument slider is for? to raise the volume of whatever instruments are actively being played.
Yes, but previous RB titles (except the first, I think) had the bass boost option to boost the bass even more, which was really great. Since even with the intrument slider all the way up, bass can still be hard to hear unless you put BG instruments all the way down (I don't even know if this option exists in RB4).